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The Garmin Communicator Plugin needs to be installed on your computer.http://www8.garmin.com/products/communicator

Also check to be sure that the data cable is the correct one.When connect between the nuvi and the computer, the nuvi should show that it is in mass storage mode by displaying a computer on the screen.

The correct cable is Garmin part number 010-10723-01.http://www.gpscity.com/garmin-usb-pc-cable.html

Look near the serial number there should be a reset button there. Also make sure when you connecting your Garmin to the computer do not use a USB hub connect it directly to a USB port on the pc. I have attached a link to the manual for your unit. Thanks for using FixYa

When you connect the 750 to a computer it goes into data mode and the screen shows only the connected to PC icon. Let it charge for a few hours and then disconnect it from your computer and it will come up in Navigation mode,

You need to obtain a USB data cable to connect your Nuvi to a PC. Go to Garmin's website at www.garmin.com and download their webupdater program. Install it on your PC and connect your Nuvi to your PC. It will allow you to download the missing voices.

Go to garmin website www.garmin.com and download the latest USB drivers. After installing the latest USB drivers reboot the computer. Now attach the Garmin to the computer using USB cable. You should see Found new Hardware on your computer.